Aims: To report a series of uterine corpus (n = 7) and ovarian (n = 5) neoplasms which we believe probably represent mesonephric adenocarcinomas based on their characteristic morphology and immunophenotype.
Methods and results: All neoplasms exhibited a relatively constant and characteristic morphological appearance with an admixture of architectural patterns with small glands or tubules, some containing luminal eosinophilic colloid-like material, typically predominating. Solid and papillary architectures were also often present. The nuclear features were characteristic with atypical angulated clear vesicular nuclei which often exhibited overlapping. All the tumours were 'flat' negative with oestrogen receptor and progesterone receptor and all except one exhibited nuclear staining with thyroid transcription factor 1 (TTF1), which was often diffuse. All tumours exhibited wild-type staining with p53. CD10, calretinin and GATA binding protein 3 (GATA3) were positive in a variable proportion of the neoplasms.
Conclusions: We believe these neoplasms to represent mesonephric adenocarcinomas which have only rarely been reported to arise in the uterine corpus and never in the ovary. We recommend they be termed mesonephric-like adenocarcinomas until their histogenesis is firmly established.
Keywords: TTF1; hormone receptors; mesonephric adenocarcinoma; ovary; uterus.
© 2015 John Wiley & Sons Ltd.